Charger port daughter board would need to be replaced as from what you said sounds like the charger port has gone faulty. Resetting the phone wouldn't help.
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Shorting the two pins corresponding to battery + and - on the phone and not the battery has helped for some people. What this does exactly is create a short circuit without the battery connected to drain any components that may be holding charge on the circuit board that could trigger that battery temperature warning message. Also try cleaning both battery connector contacts if that does not help too.
Charger port daughter board would need to be replaced as from what you said sounds like the charger port has gone faulty. Resetting the phone wouldn't help.